We had uneven temperature in 2nd floor bedrooms and I found that insulation in attic was low in some areas, especially above the bathrooms due to disturbance during bathroom renovation. Recommended by a friend, I contacted Darwin to top up insulation. He provided very honest and reasonable quote. I decided to go with him. He came a bit late but he called on time that he would be late. After his arrival, he explained the whole process. He covered the floor and stairs with cloth so that he could wear shoes walking up and down the floors. He took a bunch of baffles and installed them before blowing the loosened insulation into attic. The whole process took several hours. After the job is done, he asked me to climb the ladder to take look at the result. The final result was superb and he did not leave any garbage behind. Excellent work! He and his partner are very friendly, honest and hardworking. I highly recommend his work.